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I was just being cautious since I haven't done it and wanted to hear from others with experience..

As others mentioned, from a BB perspective you'll be fine. The only concern would be if your parameters were wildly different from the new water you were putting in, but "draining while you're filling" should make for a less stressful transition.

Match temps and you should be good. Only time this would cause a problem is if you buffer your water heavily, and I wouldn't attempt with certain species or fry. Calvus, sand sifters etc could react poorly.